If your strategy had active orders before the crash and the orders are still live at broker, you will need to cancel them manually. Because when you turn on automation back again, the strategy will not work with those pending orders, it will work only with new orders, what can lead you to possible overfill.

You need to find out what is your current position, amount of open contracts and average entry price if you are not flat and use this information to sync the strategy on start.